Before calling blk_mq_map_queues(), the mq_map and nr_queues belonging to "struct blk_mq_queue_map" must be a vaild value. If nr_queues is set to 0, the system may encounter the "divide zero" depending on the type of architecture. blk_mq_map_queues() -> queue_index() Signed-off-by: Jinyoung Choi <j-young.choi@xxxxxxxxxxx> --- drivers/scsi/ufs/ufshcd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 41d85b69fa50..36c5ca62ae0c 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -2674,21 +2674,21 @@ static int ufshcd_map_queues(struct Scsi_Host *shost) for (i = 0; i < shost->nr_maps; i++) { struct blk_mq_queue_map *map = &shost->tag_set.map[i]; switch (i) { case HCTX_TYPE_DEFAULT: case HCTX_TYPE_POLL: map->nr_queues = 1; break; case HCTX_TYPE_READ: map->nr_queues = 0; - break; + continue; default: WARN_ON_ONCE(true); } map->queue_offset = 0; ret = blk_mq_map_queues(map); WARN_ON_ONCE(ret); } return 0; } -- 2.25.1